Matched Pair RCA / Cunningham 6F5 Vacuum Tubes Compact Disk CD US-manufactured Amperex 7699 tube tested

US-manufactured Amperex 7699 tube tested to spec on our Paul Hart-calibrated TV7/U

These six 12BY7 / 12BY7A / 12BV7 tubes tested as follows on our Paul Hart-calibrated TV7/U where minimum (65%) is 46:

This LP is in nice shape with the occasional pop and tick

48 and 48 where minimum (65%) is 30 and 100% is 47

Matched Pair RCA / Cunningham 6F5 Vacuum Tubes Compact Disk CD US-manufactured Amperex 7699 tube testedThis matched pair of Cunningham RCA 6F5s were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and both measured 33 where minimum (65%) is 25. These tubes were made in the same factory and come from that cusp in time after the RCA buyout of Cunningham. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL